Can anyone tell me what this hose is? and if it should be connected to anything?


It doesn't seem to be a vacuum line, at least it's not doing anything when the engine is running.

 

Looks like just a vent hose for your transmission if it's an auto.

 

but why would a vent hose go upward and now down? But that would have been my guess too is a vent hose

 

They pointing upward to let the air out when you are filling the fluid, also releases the pressure of the moving parts, it they vent it down then the fluid will come out all the time and also it will take in water when you drive through a puddle of water. Even a manual transmission has a vent pointing up :-)
.

 

OK so it's an air vent for the Auto trans, when fluid is added to the trans. (lower down) this vent allows the fluid to fill the trans to correct level without, (excuse me) burping?
Doesn't need to be connected to anything. So there is nothing wrong I guess.
Maybe I should turn it around so it points UP.

 

You're correct, do not plug it up or it may hart the transmission by blowing the front seal out.

 

It hooks over & points down at the end so that dirt doesn't fall into the open end of the hose. Fluid won't pour out because it connects to the top of the transmission case.

Pretty much everything has to have a vent. Engine crankcase vents through the PCV system. Manual trans vents are usually much smaller & have a vented cap that kinda looks like a rubber cap stuck onto the top of a metal pipe. Look closely and it'll have a vent hole - the rubber cap doesn't seal.

Battery has vents. Brake fluid reservoir cap has a tiny vent hole. Those are all needed to allow the air inside to expand with temperature.

 

ahhhhh that makes total sense....they call it dope for a reason. lol

 

I think I am laughing at myself, it is all to obvious. Maybe I am looking for something to fix.
Thanks for the input.!

 

after reading the last few post...I feel dumb cus my common sense didn't kick in..lol

Well at least you know nothing is wrong.